This was one of my favorites, too! It's girly without being juvenile, and the colors compliment each other so well (love the brown on the under-side of the handles). There was a Saddle Bag that came out in Spring 2016 that had a very similar floral print (blue flowers on black) except it was only released in haircalf. The leather definitely compliments the print more and gives it more dimension.
Prior to this collection, I had only seen the Bonnie Cashin "Double Header" bags also. I did some research, and it appears that the Mailbox Bag is indeed a rare gem from the archives that was only available in the 60's and 70's. It hasn't been reissued since. I've put together some archive information below for those who are curious.
I don't quite understand the "Rural Free Delivery" joke in the original bag's name, but that what Bonnie called it haha.
Coach by Bonnie Cashin No. 9215 "RFD (Rural Free Delivery) Mail Box Bag"
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I'm actually thinking that the kisslocks on the largest size (the one currently for sale) would fit an iPhone 7, and I think that's pretty convenient.
I hope they release an XXL Men's Duffle Mailbox version. I'd be all over that!